US3182166A - Microwave ovens - Google Patents
Microwave ovens Download PDFInfo
- Publication number
- US3182166A US3182166A US220807A US22080762A US3182166A US 3182166 A US3182166 A US 3182166A US 220807 A US220807 A US 220807A US 22080762 A US22080762 A US 22080762A US 3182166 A US3182166 A US 3182166A
- Authority
- US
- United States
- Prior art keywords
- oven
- well
- microwave
- enclosure
- bottom wall
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 description 10
- 230000005684 electric field Effects 0.000 description 4
- 235000013305 food Nutrition 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 240000005369 Alstonia scholaris Species 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000003989 dielectric material Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 235000013611 frozen food Nutrition 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 235000012054 meals Nutrition 0.000 description 1
- 235000013372 meat Nutrition 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
- 238000010257 thawing Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B6/00—Heating by electric, magnetic or electromagnetic fields
- H05B6/64—Heating using microwaves
- H05B6/6408—Supports or covers specially adapted for use in microwave heating apparatus
- H05B6/6411—Supports or covers specially adapted for use in microwave heating apparatus the supports being rotated
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S99/00—Foods and beverages: apparatus
- Y10S99/14—Induction heating
Definitions
- a major problem of heating an object in a microwave field is the uneven distribution of heat in the object.
- Unequal distribution of heat can result from a variety of causes.
- standing wave patterns set up in the oven enclosure sustain minimum and maximum points of field intensity which in turn cause the portions of the object in the more intense field regions to be heated more than the portions in the minimum field intensity regions.
- the object to be heated such as a meal containing several different foods, is electrically nonhomogeneous.
- objects such as fibers in meats and ice crystals in frozen foods are electrically anisotropic.
- the electrical properties of an object may change during heating, for example, during the thawing of frozen materials, and do so to a different degree in different parts of the object.
- One of the prior techniques seeking to obtain a uniform heating of objects in ovens employs a rotating turntable which is mounted in a position asymmetrical with respect to the electrical field.
- the microwave field pat tern in the oven enclosure has minimum and maximum field intensities in the plane of the turntable as Well as perpendicular to the plane of the turntable.
- the primary object of the present invention is to provide a microwave oven which will evenly heat an object.
- Another object of the present invention is to provide a microwave oven which accommodates high power inputs and thereby allows rapid heating of objects.
- Still a further object of the present invention is to provide a microwave oven which is compact.
- Yet another object of the present invention is to provide a microwave oven which has a minimum of mechanical movement and need for maintenance.
- the invention resides in a microwave oven, having a source of microwave energy, the oven having a rotatable dielectric turntable mounted over a cylindrical well in the oven enclosure.
- the bottom surface of the well is an integral number of quarter wavelengths below the floor of the oven. Covering the well at the level of the oven floor are a plurality of fixed metallic grids. As the turntable is rotated, objects thereon are uniformly heated by mode patterns of microwave energy set up in the oven.
- FIG. 1 depicts a microwave oven in accordance with the invention.
- FIG. 2 depicts a detailed arrangement of the turntable used in the oven.
- FIGS. 1 and 2 there is shown a microwave oven 2 into which objects 4, such as foods, are placed to be heated.
- a generator 6 conventionally a magnetron tube, feeds microwave energy into a waveguide 8 by means of a radiating probe 12.
- the waveguide in turn transmits the microwave energy into the oven through a coupling slot 14.
- a turntable 16 upon which the object to be heated is placed, is arranged to rotate on a shaft 18.
- the turntable is constructed of a dielectric material and has a downturned edge.
- a well 24 which is a quarter wavelength deep.
- the well is formed by a side wall 26 and a bottom wall 28.
- a polarizing grid 30 is mounted on the side wall so that it is flush with the ovens floor and covers the well.
- the shaft 18 has a metallic disc 32 which is a half wavelength in diameter attached thereto. The disc is in close proximity to the botom wall 28 of the well, thereby forming a choke joint which prevents microwave energy from leaking out the opening in the bottom wall where the shaft passes through.
- Power to drive the shaft is supplied by a prime mover (not shown) through a shaft 34 keyed to gear 36.
- Gear 36 meshes with a gear 38 which drives the shaft 18.
- the objects weight causes shaft 18 to move downwardly, causing a counterlever 42 which is attached to the shaft 18 to pivot.
- the counterlever is pivoted on a member 44. Downward movement of the shaft upon one end of the counterlever causes the other end of the counterlever 42 to move upward and close contacts 48 which thereupon completes circuit 52 controlling the power to microwave generator 6.
- the microwave power to the oven cannot be turned on due to contacts 48 being open.
- the downward movement of shaft 18 need not be appreciable since its only purpose is to close contacts 48.
- a drain 54 having a hose 56 attached thereto, allows any water forming on the bottom of the well 24 to be drained off.
- the bottom wall 28 of the well is slightly raised at 58 to prevent any water from running down the shaft opening.
- operation of the device of FIG. 2 is as follows:
- Microwave energy is radiated into the oven through the coupling slot 14 and a pattern of standing waves is set up in the oven.
- a part of the standing Waves are set up between the bottom and top of the oven.
- microwave energy whose electric field is parallel to the wires of grid 30 will be reflected thereby, while wave energy whose electric field is perpendicular thereto will pass through and be reflected by the bottom wall 28 of the enclosure. Since the well is a quarter wavelength deep, the standing wave pattern of modes reflected by the polarizing grids 30 and the bottom wall 28 will be displaced with respect to each other. Further, because grid 30 is flush with the floor 22, the standing wave pattern set up by the floor 22 will be continuous with that set up by the grid.
- the oven will be energized by wave energy in several different modes, thereby setting up a plurality of different standing wave patterns.
- Each of the plurality of modes have minimum and maximum points of field intensity occurring close together so that it is no longer important as in the past to move the object to be heated up and down, but mere rotation of the turntable sufiices to equalize heating throughout the object to such a degree that thermal conduction is not needed to be relied upon to any considerable extent to ensure even heating, even when heating is carried out rapidly at high power density.
- the device allows the use of a small oven enclosure in which high power density can be obtained at relatively low power input levels. While the embodiment shown illustrates the use of a vertical movement of the turntable when an object is placed thereupon to actuate a simple on-off type switch, the lever mechanism shown also eifectively acts to counter-balance the weight of the object on the turntable.
- the simple on-olf switch 48 can be replaced by a control mechanism which responds to changes in weight to control the amount of microwave power supplied to the oven.
- a microwave oven comprising,
- an enclosure for confining microwave energy having top, bottom, and side walls;
- the bottom wall of the enclosure having a generally cylindrical edge defining an opening therein;
- polarizing grid disposed over the well, the polarizing grid being mounted flush with the bottom wall of V the enclosure;
- Apparatus in accordance with claim 1 and further including a shaft secured to the turntable, the shaft protruding through the bottom wall of the well and being movable vertically, and means actuated by the vertical movement of the shaft for controlling a circuit permitting power to be applied to the microwave oven.
Description
y 1965 H. BOHM ETAL 3,182,166
MICROWAVE OVENS Filed Aug. 51, 1962 H I H F l G. 2
W 4 @f m -zs x1 52 L INVENTORS HELMUT BOHM HERB RT DURAS BY WM UMAAQA p K, I
ATTORNEYS United States Patent 4 Claims. 01. 219-1055 This invention relates in general to microwave ovens and more particularly to apparatus for insuring equalized heating of foods and other substances exposed to microwave energy in the oven.
A major problem of heating an object in a microwave field is the uneven distribution of heat in the object. Unequal distribution of heat can result from a variety of causes. For example, standing wave patterns set up in the oven enclosure sustain minimum and maximum points of field intensity which in turn cause the portions of the object in the more intense field regions to be heated more than the portions in the minimum field intensity regions. Also, the object to be heated, such as a meal containing several different foods, is electrically nonhomogeneous. Further, objects such as fibers in meats and ice crystals in frozen foods are electrically anisotropic. Moreover, the electrical properties of an object may change during heating, for example, during the thawing of frozen materials, and do so to a different degree in different parts of the object.
One of the prior techniques seeking to obtain a uniform heating of objects in ovens employs a rotating turntable which is mounted in a position asymmetrical with respect to the electrical field. The microwave field pat tern in the oven enclosure has minimum and maximum field intensities in the plane of the turntable as Well as perpendicular to the plane of the turntable. By rotating the turntable, while at the same time moving the turntable up and down, objects mounted on the turntable will move in a series of helicoidal trajectories and all parts of the objects will move through minimum and maximum points of electrical field intensity, thereby evenly heating the objects. Although even heating may be obtained with the aforementioned apparatus, it has been found that the two-dimensional drive entails mechanical complications, is continuously in need of maintenance, consumes a large amount of space, and is apt to be quite noisy.
The primary object of the present invention is to provide a microwave oven which will evenly heat an object.
Another object of the present invention is to provide a microwave oven which accommodates high power inputs and thereby allows rapid heating of objects.
Still a further object of the present invention is to provide a microwave oven which is compact.
Yet another object of the present invention is to provide a microwave oven which has a minimum of mechanical movement and need for maintenance.
The invention resides in a microwave oven, having a source of microwave energy, the oven having a rotatable dielectric turntable mounted over a cylindrical well in the oven enclosure. The bottom surface of the well is an integral number of quarter wavelengths below the floor of the oven. Covering the well at the level of the oven floor are a plurality of fixed metallic grids. As the turntable is rotated, objects thereon are uniformly heated by mode patterns of microwave energy set up in the oven.
Other objects and many of the attendant advantages of the invention will be readily appreciated as the invention becomes better understood by reference to the following 3,132,186 Patented May 4, 1965 detailed description when considered in connection with the accompanying drawings wherein:
FIG. 1 depicts a microwave oven in accordance with the invention; and
FIG. 2 depicts a detailed arrangement of the turntable used in the oven.
Referring now to FIGS. 1 and 2, there is shown a microwave oven 2 into which objects 4, such as foods, are placed to be heated. A generator 6, conventionally a magnetron tube, feeds microwave energy into a waveguide 8 by means of a radiating probe 12. The waveguide in turn transmits the microwave energy into the oven through a coupling slot 14.
As shown in FIG. 2, a turntable 16, upon which the object to be heated is placed, is arranged to rotate on a shaft 18. The turntable is constructed of a dielectric material and has a downturned edge. Directly in the center of the floor 22 of the oven, as shown in FIG. 2, there is a well 24 which is a quarter wavelength deep. The well is formed by a side wall 26 and a bottom wall 28. A polarizing grid 30 is mounted on the side wall so that it is flush with the ovens floor and covers the well. The shaft 18 has a metallic disc 32 which is a half wavelength in diameter attached thereto. The disc is in close proximity to the botom wall 28 of the well, thereby forming a choke joint which prevents microwave energy from leaking out the opening in the bottom wall where the shaft passes through.
Power to drive the shaft is supplied by a prime mover (not shown) through a shaft 34 keyed to gear 36. Gear 36 meshes with a gear 38 which drives the shaft 18. When an object is placed on the turntable 16, the objects weight causes shaft 18 to move downwardly, causing a counterlever 42 which is attached to the shaft 18 to pivot. The counterlever is pivoted on a member 44. Downward movement of the shaft upon one end of the counterlever causes the other end of the counterlever 42 to move upward and close contacts 48 which thereupon completes circuit 52 controlling the power to microwave generator 6. Thus, unless an object is placed on the turntable, the microwave power to the oven cannot be turned on due to contacts 48 being open. The downward movement of shaft 18 need not be appreciable since its only purpose is to close contacts 48.
A drain 54, having a hose 56 attached thereto, allows any water forming on the bottom of the well 24 to be drained off. The bottom wall 28 of the well is slightly raised at 58 to prevent any water from running down the shaft opening.
With the foregoing in mind, operation of the device of FIG. 2 is as follows:
Microwave energy is radiated into the oven through the coupling slot 14 and a pattern of standing waves is set up in the oven. A part of the standing Waves are set up between the bottom and top of the oven. In the vicinity of well 24, microwave energy whose electric field is parallel to the wires of grid 30 will be reflected thereby, while wave energy whose electric field is perpendicular thereto will pass through and be reflected by the bottom wall 28 of the enclosure. Since the well is a quarter wavelength deep, the standing wave pattern of modes reflected by the polarizing grids 30 and the bottom wall 28 will be displaced with respect to each other. Further, because grid 30 is flush with the floor 22, the standing wave pattern set up by the floor 22 will be continuous with that set up by the grid.
Consistent with the physical dimensions of the enclosure and the well, the oven will be energized by wave energy in several different modes, thereby setting up a plurality of different standing wave patterns. Each of the plurality of modes have minimum and maximum points of field intensity occurring close together so that it is no longer important as in the past to move the object to be heated up and down, but mere rotation of the turntable sufiices to equalize heating throughout the object to such a degree that thermal conduction is not needed to be relied upon to any considerable extent to ensure even heating, even when heating is carried out rapidly at high power density.
Therefore, it can be seen that the device allows the use of a small oven enclosure in which high power density can be obtained at relatively low power input levels. While the embodiment shown illustrates the use of a vertical movement of the turntable when an object is placed thereupon to actuate a simple on-off type switch, the lever mechanism shown also eifectively acts to counter-balance the weight of the object on the turntable.
As the food in the oven is heated, its weight changes because of the vaporization of its water and other volatile substances. Therefore, the simple on-olf switch 48 can be replaced by a control mechanism which responds to changes in weight to control the amount of microwave power supplied to the oven.
Obviously, many modifications and variations of the present invention are possible in the light of the foregoing teachings. It is to be understood, therefore, that the invention is not limited in its application to the details of construction and arrangement of parts specifically described or illustrated, and that within the scope of the appended claims, it may be practiced otherwise than as specifically described or illustrated.
We claim:
1. A microwave oven comprising,
an enclosure for confining microwave energy, having top, bottom, and side walls;
a source of microwave energy;
means for coupling energy from the source tothe enclosure;
the bottom wall of the enclosure having a generally cylindrical edge defining an opening therein;
a well having a wave reflective bottom wall and a side wall, the side wall of the well connectingthe bottom wall of the enclosure at the opening thereof to the bottom wall of the Well; 7
a polarizing grid disposed over the well, the polarizing grid being mounted flush with the bottom wall of V the enclosure; and
a dielectric turntable in the oven, the turntable being disposed above the well.
2. Apparatus in accordance with claim 1 wherein the distance between the bottom wall of the enclosure and the bottom wall of the well is one quarter Wavelength.
3. Apparatus in accordance with claim 1, and further including a shaft secured to the turntable, the shaft protruding through the bottom wall of the well and being movable vertically, and means actuated by the vertical movement of the shaft for controlling a circuit permitting power to be applied to the microwave oven.
4. Apparatus in accordance with claim 3 wherein said shaft protrudes through an opening in the bottom wall References Cited by the Examiner UNITED STATES PATENTS 2,744,990 5/56 Schroeder 219 1o.5s 2,888,543 5/59 Haagensen 219 10.55 2,993,973 7/61 Johnson er al 219-10.5s
OTHER REFERENCES German application 1,066,679, printed Oct. 9, 1959.
RICHARD M. WOOD, Primary Examiner.
Claims (1)
1. A MICROWAVE OVER COMPRISING, AN ENCLOSURE FOR CONFINING MICROWAVE ENERGY, HAVING TOP, BOTTOM, AND SIDE WALLS; A SOURCE OF MICROWAVE ENERGY; MEANS FOR COUPLING ENERGY FROM THE SOURCE TO THE ENCLOSURE; THE BOTTOM WALL OF THE ENCLOSURE HAVING A GENERALLY CYLINDRICAL EDGE DEFINING AN OPENING THEREIN; A WELL HAVING A WAVE REFLECTIVE BOTTOM WALL AND A SIDE WALL, THE SIDE WALL OF THE WELL CONNECTING THE BOTTOM WALL OF THE ENCLOSURE AT THE OPENING THEREOF TO THE BOTTOM WALL OF THE WELL;
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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DED0036961 | 1961-09-04 |
Publications (1)
Publication Number | Publication Date |
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US3182166A true US3182166A (en) | 1965-05-04 |
Family
ID=7043374
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US220807A Expired - Lifetime US3182166A (en) | 1961-09-04 | 1962-08-31 | Microwave ovens |
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Cited By (32)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3281567A (en) * | 1963-10-28 | 1966-10-25 | Litton Prec Products Inc | Oven protective device |
US3288894A (en) * | 1963-08-26 | 1966-11-29 | Gen Motors Corp | Method of insulating a hollow-walled cabinet which includes using uniformly distributed and spread microwaves for heating |
US3300615A (en) * | 1963-07-09 | 1967-01-24 | Lyons & Co Ltd J | Electronic ovens |
US3373259A (en) * | 1965-03-26 | 1968-03-12 | Lyons & Co Ltd J | Electronic oven |
US3492454A (en) * | 1965-02-09 | 1970-01-27 | Lyons & Co Ltd J | Electronic oven |
US3500742A (en) * | 1966-12-15 | 1970-03-17 | Pierre Tanguy | Coded food packages and device permitting to cook said packages according to coded information thereon |
US3505490A (en) * | 1966-10-07 | 1970-04-07 | Raytheon Co | Apparatus for thawing of frozen materials |
US3526737A (en) * | 1967-03-20 | 1970-09-01 | Varian Associates | Microwave heating apparatus |
US3566066A (en) * | 1968-08-30 | 1971-02-23 | Dunlop Co Ltd | Apparatus for heating articles |
US3570391A (en) * | 1967-06-27 | 1971-03-16 | Rejlers Ingenjoersbyra Ab | Electronic or microwave furnace or oven |
US3872783A (en) * | 1973-03-12 | 1975-03-25 | Dca Food Ind | Frying apparatus |
US3909598A (en) * | 1973-07-20 | 1975-09-30 | Cem Corp | Automatic volatility computer |
US3927291A (en) * | 1973-06-29 | 1975-12-16 | Raytheon Co | Reduced speed compensator for microwave heating applicator |
US3932723A (en) * | 1973-04-20 | 1976-01-13 | Tokyo Shibaura Electric Co., Ltd. | Electronic range with automatic electronic digital timer |
DE2618603A1 (en) * | 1975-04-30 | 1976-11-04 | Matsushita Electric Ind Co Ltd | MICROWAVE OVEN |
FR2322508A1 (en) * | 1975-08-27 | 1977-03-25 | Matsushita Electric Ind Co Ltd | ROTATING PLATE DRIVE MECHANISM IN AN ELECTRONIC OVEN |
US4132811A (en) * | 1974-05-30 | 1979-01-02 | The Pillsbury Company | Food package for assuring uniform distribution of microwave energy and process for heating food |
FR2450024A1 (en) * | 1979-02-23 | 1980-09-19 | Pruines Iseco De | Microwave oven with food weight control - employs balance system in oven to control oven operating time |
US4326113A (en) * | 1976-09-06 | 1982-04-20 | Sharp Kabushiki Kaisha | Heater disposed below a turntable in a combination microwave and electric oven |
FR2605716A1 (en) * | 1986-10-28 | 1988-04-29 | Gold Star Co | Device for protecting the shaft of the turntable in a microwave oven |
WO1988007805A1 (en) * | 1987-03-31 | 1988-10-06 | Miele & Cie. Gmbh & Co. | Microwave oven with rotary plate |
US4784052A (en) * | 1986-09-16 | 1988-11-15 | Harada Kogyo Kabushiki Kaisha | Cooking appliance |
USRE32861E (en) * | 1973-07-20 | 1989-02-07 | Cem Corporation | Automatic volatility computer |
US20050258173A1 (en) * | 2004-05-21 | 2005-11-24 | Maytag Corporation | Microwave intensification system for a conveyorized microwave oven |
US20100308035A1 (en) * | 2009-06-04 | 2010-12-09 | Tsann Kuen (Zhangzhou) Enterprise Co., Ltd. | Microwave oven with a drainage system |
US20110048244A1 (en) * | 2009-08-28 | 2011-03-03 | Wiker John H | Apparatus and method for controlling a combustion blower in a gas-fueled conveyor oven |
US20110048245A1 (en) * | 2009-08-28 | 2011-03-03 | Schjerven Sr William S | Apparatus and method for controlling a conveyor oven |
US8839779B2 (en) | 2004-03-23 | 2014-09-23 | Middleby Corporation | Conveyor oven apparatus and method |
US9585400B2 (en) | 2004-03-23 | 2017-03-07 | The Middleby Corporation | Conveyor oven apparatus and method |
US10004115B2 (en) | 2016-06-13 | 2018-06-19 | The Markov Corporation | Electronic oven with reflective energy steering |
US10009957B2 (en) | 2016-03-30 | 2018-06-26 | The Markov Corporation | Electronic oven with infrared evaluative control |
US10024548B2 (en) | 2003-02-21 | 2018-07-17 | The Middleby Corporation | Self-cleaning oven |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2744990A (en) * | 1951-01-24 | 1956-05-08 | Gen Electric | Ultrahigh frequency heating apparatus |
US2888543A (en) * | 1953-11-12 | 1959-05-26 | Raytheon Mfg Co | Electronic heating apparatus |
US2993973A (en) * | 1959-04-06 | 1961-07-25 | Westinghouse Electric Corp | Microwave oven apparatus |
-
1962
- 1962-08-31 US US220807A patent/US3182166A/en not_active Expired - Lifetime
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2744990A (en) * | 1951-01-24 | 1956-05-08 | Gen Electric | Ultrahigh frequency heating apparatus |
US2888543A (en) * | 1953-11-12 | 1959-05-26 | Raytheon Mfg Co | Electronic heating apparatus |
US2993973A (en) * | 1959-04-06 | 1961-07-25 | Westinghouse Electric Corp | Microwave oven apparatus |
Cited By (44)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3300615A (en) * | 1963-07-09 | 1967-01-24 | Lyons & Co Ltd J | Electronic ovens |
US3288894A (en) * | 1963-08-26 | 1966-11-29 | Gen Motors Corp | Method of insulating a hollow-walled cabinet which includes using uniformly distributed and spread microwaves for heating |
US3281567A (en) * | 1963-10-28 | 1966-10-25 | Litton Prec Products Inc | Oven protective device |
US3492454A (en) * | 1965-02-09 | 1970-01-27 | Lyons & Co Ltd J | Electronic oven |
US3373259A (en) * | 1965-03-26 | 1968-03-12 | Lyons & Co Ltd J | Electronic oven |
US3505490A (en) * | 1966-10-07 | 1970-04-07 | Raytheon Co | Apparatus for thawing of frozen materials |
US3500742A (en) * | 1966-12-15 | 1970-03-17 | Pierre Tanguy | Coded food packages and device permitting to cook said packages according to coded information thereon |
US3526737A (en) * | 1967-03-20 | 1970-09-01 | Varian Associates | Microwave heating apparatus |
US3570391A (en) * | 1967-06-27 | 1971-03-16 | Rejlers Ingenjoersbyra Ab | Electronic or microwave furnace or oven |
US3566066A (en) * | 1968-08-30 | 1971-02-23 | Dunlop Co Ltd | Apparatus for heating articles |
US3872783A (en) * | 1973-03-12 | 1975-03-25 | Dca Food Ind | Frying apparatus |
US3932723A (en) * | 1973-04-20 | 1976-01-13 | Tokyo Shibaura Electric Co., Ltd. | Electronic range with automatic electronic digital timer |
US3927291A (en) * | 1973-06-29 | 1975-12-16 | Raytheon Co | Reduced speed compensator for microwave heating applicator |
USRE32861E (en) * | 1973-07-20 | 1989-02-07 | Cem Corporation | Automatic volatility computer |
US3909598A (en) * | 1973-07-20 | 1975-09-30 | Cem Corp | Automatic volatility computer |
US4132811A (en) * | 1974-05-30 | 1979-01-02 | The Pillsbury Company | Food package for assuring uniform distribution of microwave energy and process for heating food |
DE2618603A1 (en) * | 1975-04-30 | 1976-11-04 | Matsushita Electric Ind Co Ltd | MICROWAVE OVEN |
FR2322508A1 (en) * | 1975-08-27 | 1977-03-25 | Matsushita Electric Ind Co Ltd | ROTATING PLATE DRIVE MECHANISM IN AN ELECTRONIC OVEN |
US4326113A (en) * | 1976-09-06 | 1982-04-20 | Sharp Kabushiki Kaisha | Heater disposed below a turntable in a combination microwave and electric oven |
FR2450024A1 (en) * | 1979-02-23 | 1980-09-19 | Pruines Iseco De | Microwave oven with food weight control - employs balance system in oven to control oven operating time |
US4784052A (en) * | 1986-09-16 | 1988-11-15 | Harada Kogyo Kabushiki Kaisha | Cooking appliance |
FR2605716A1 (en) * | 1986-10-28 | 1988-04-29 | Gold Star Co | Device for protecting the shaft of the turntable in a microwave oven |
WO1988007805A1 (en) * | 1987-03-31 | 1988-10-06 | Miele & Cie. Gmbh & Co. | Microwave oven with rotary plate |
US10024548B2 (en) | 2003-02-21 | 2018-07-17 | The Middleby Corporation | Self-cleaning oven |
US10036558B2 (en) | 2003-02-21 | 2018-07-31 | The Middleby Corporation | Self-cleaning oven |
US10842156B2 (en) | 2004-03-23 | 2020-11-24 | The Middleby Corporation | Conveyor oven apparatus and method |
US8839779B2 (en) | 2004-03-23 | 2014-09-23 | Middleby Corporation | Conveyor oven apparatus and method |
US9585400B2 (en) | 2004-03-23 | 2017-03-07 | The Middleby Corporation | Conveyor oven apparatus and method |
US9585401B2 (en) | 2004-03-23 | 2017-03-07 | The Middleby Corporation | Conveyor oven apparatus and method |
US10039289B2 (en) | 2004-03-23 | 2018-08-07 | The Middleby Corporation | Conveyor oven apparatus and method |
US7081605B2 (en) | 2004-05-21 | 2006-07-25 | Maytag Corporation | Microwave intensification system for a conveyorized microwave oven |
US20050258173A1 (en) * | 2004-05-21 | 2005-11-24 | Maytag Corporation | Microwave intensification system for a conveyorized microwave oven |
US20100308035A1 (en) * | 2009-06-04 | 2010-12-09 | Tsann Kuen (Zhangzhou) Enterprise Co., Ltd. | Microwave oven with a drainage system |
US20110048244A1 (en) * | 2009-08-28 | 2011-03-03 | Wiker John H | Apparatus and method for controlling a combustion blower in a gas-fueled conveyor oven |
US20110048245A1 (en) * | 2009-08-28 | 2011-03-03 | Schjerven Sr William S | Apparatus and method for controlling a conveyor oven |
US8839714B2 (en) | 2009-08-28 | 2014-09-23 | The Middleby Corporation | Apparatus and method for controlling a conveyor oven |
US9609981B2 (en) | 2009-08-28 | 2017-04-04 | The Middleby Corporation | Apparatus and method for controlling a conveyor oven |
US10362898B2 (en) | 2009-08-28 | 2019-07-30 | The Middleby Corporation | Apparatus and method for controlling a conveyor oven |
US10009957B2 (en) | 2016-03-30 | 2018-06-26 | The Markov Corporation | Electronic oven with infrared evaluative control |
US10681776B2 (en) | 2016-03-30 | 2020-06-09 | Markov Llc | Electronic oven with infrared evaluative control |
US11632826B2 (en) | 2016-03-30 | 2023-04-18 | Markov Llc | Electronic oven with infrared evaluative control |
US10426000B2 (en) | 2016-06-13 | 2019-09-24 | The Markov Corporation | Electronic oven with reflective energy steering |
US10004115B2 (en) | 2016-06-13 | 2018-06-19 | The Markov Corporation | Electronic oven with reflective energy steering |
US10863593B2 (en) | 2016-06-13 | 2020-12-08 | Markov Llc | Electronic oven with reflective energy steering |
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